Friction-clutch.



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PATENTED MAR. 1'7, 1908. F. A. COLWELL.

FRICTION CLUTCH.

APPLICATION FILED MAR. 21, 1907.

2 SHEETS-SHEET 1.

PATENTED MAR. 17, 1908. F. A. COLWELL.

PRIOTION CLUTCH. APPLIOATION FILED MAR. 21, 1907.

2 SHEETS-SHEET 2.

fig, j

NUR/VE ys `UNITED STATES PATENT critica FRANKxA. COLWLL, OF OAKESDALE,` WASHINGTON.

' designed for placing ulleys into or out of o erative relation wit the shafts on which t ey are mounted.

One of the objects of the 'invention is to i'ovide a clutch .actuated by centrifugal orce for fixing avrevoluble element u on a shaft,' said means returning automatica 1y to its initial osition when the speed of the frevoluble e ement is reduced to a predetermined extent.

Another object is to provide means whereby the oentrifugally operated parts can be actuated manually for throwing the clutch into or out of operative position.

A still further object is to provide a friction ring of novel form having means of peculiar construction for expanding or contracting it.

With these and other objects in view the invention consists of certain novel features of construction and combinations of parts which will be hereinafter more fully described Iand pointed out in the claims.

In the accompanying drawings is shown thepreferredform of the invention.

In said drawings: Figure 1 is amfac'e view of a pulley having the present improvements applied thereto, a portion of the pulley 'rim being removed and the adjustable sleeve, as well as the shaft, being shown in section; Fig. 2 is an elevation of the op osite side of the pulley andfriction clutch, t e hub of the friction wheel being removed and a portion of the rim of said wheel being shown in section; Fig. 3 is a transverse section through the pulley and friction clutch; and Fig. 4 is a ,detail view of the end portions of the friction ring and the adjoining part of the friction Wheel, the vends of the'ring being shown .spaced a art.

Referring to the figures .by characters of reference, 1 is a power sha'ftron which is keyed or otherwise secured a friction wheel 2 the rim 3'0f which extends laterally therefrom and is provided with a lining 4 of wood or other suitable-material designed to be re- Specication of Letters `Patent. Application led March 21, 1907. Serial 110.663,576.

FRICTION-CLUTCH.

- Patented March 17, 1908.

moved in the event of wear and a newlining substituted therefor.

ley 5 having a hub 6 to one end of which is secured a collar 7 having an arm 8 extending therefrom. This arm is constituting a friction ring the end'portions of which are formed with inwardly extending ears 10. The rim 3 of the friction wheel surrounds the rinv 9 and the 'pulley 5 is held against remova from the friction wheel by a collarv 11 arran ed upon the shaftl and constituting an a utment for one end of the hub 6.

A stem 12 is mounted to rotate in one of the s 'okes of pulley 5 and has a head 13 locate between the ears 10 of friction ring 9. Links 14 are pivotally connected to the ears and also to. the head 13 at diametrically opposite points and by rotating the head the inks 14 will operate as toggles to spread the ends of the friction rin riphery of said rinDr wi bind a ainst the lining of the rim 3. Zy turning t e head in an opposite direction, the ears 10 will be drawn toward each other and the friction ring will therefore be withdrawn from engagement with the rim 3. The end portion of stem.12 is angular in cross section as shown at 15 and mounted thereon is an arm 16 to which is bolted or otherwise secured an arcuate member 17 having a weight 18 adjustably mounted thereon.` The free end of member 17 is connected by means of'a coiled spring 19 apart so that the pewith an ear 20 on `one of the spokes of the pulley so that said member is normally drawn inward toward the hub of the pulley and the links 14 normally maintained in the position shown in Fig. 2 thereby holding the friction ring contracted.

A socket 21 is formed in the arm 16 and is provided with a cap 22 for retaining within the socket a knob 23 formed at one end of an arm 24. This arm is pivotally connected to a sleeve 25 slidably mounted on the shaft and having an enlarged end portion 26 designed-to receive the hub 6. Guide pins 27 extend from this hub and into grooves 28 in sleeve 25 so as to prevent independent rotation of the sleeve and hub, although allowing the sleeve to be adjusted toward or from the hub. An annular groove 29 is provided with op positely `extending semi-circular members 49- 575 Loosely m'ounted upon the shaft is a pul- .formed within the sleeve and is `engaged by the -forked end of a lever fulcrumed upon ,a

bracket 31 which is loosely mounted on the shaft 1 and held against displacement thereon byvcollars" 32. f

lt is thought that vthe operation of the parts will be clearly understood. lf the shaft 1-constitutes the driving element and the lever-30 is swung in one direction, thev sleeve 25 will b'e shifted onto the hub 6 and the arm 24 will shift the arm 16 outwardly against the tension of the spring 191 This results in the spreading of friction ring 9 and the same is forced against tle linin of the rotating rim 3. The pulley 5 will tlerefore rotate with the friction wheel 2 and the arcuate member 17and its wei ht 18 will be swung outward by centrifuga force so as to maintain the arts in ^their adjusted positions. The pu ley can be readily uncoupled from the friction wheel by shifting the sleeve 25 away from the hub 6 whereupon the' arm lconstruction the pul 24 will pull inward on the arm 16 and cause a the friction ring to be contracted. If the tain, the friction ring in adjusted positionA By removing the cap-22 the knob`23 can be withdrawn from the socket 21 and the arm 24 and sleeve 25 dis ensed with. With this ley 5 should be the driving element and'while rotating it will cause the weighted member 17 to be swun outward and cause the friction ring-to bin upon the rim of wheel 2 and the pulley and friction wheel will therefore rotate together until the movement of the pulley is stopped in some manner, Vsuch as by the application of more than a predetermined resistance thereto. When the arts operate in this manner the pulley will e automatically disengaged from the friction wheel 2 whenever objects become caught accidentally within the driven machinery. This is due tothe reduction of 4centrifugal force and the proportionate reduction of frictioal contact between the i wheel.2 and the friction ring. Theweight -18 can be adjusted on themember 17 so that, the friction will be applied only when a predetermined speed .ofrotation is produced.1

What 1s claimed is:

1. TheA combination with a shaft and a l friction rim revoluble therewith; of a pulley lated 'means upon the p .spreading device, and manually operated loosely mounted on .the shaft, a friction ring revoluble therewith and within the rim, a revoluble spreading device connected to the end portions of the rin centrifugally operey for actuating the means for rotating the spreading device within, and during the rotation of the pulley. C

2. The combination with a shaft and a friction rim revoluble therewith; of a pulley loosely mounted on the shaft, an expansible friction ring within the rim and upon and -movable with the pulley, a revoluble spreadoperated means upon the pul ey for actuating the spreading device, and manually v0peratecl means for rotating the' spreadin device within, and during the rotation o the pulley. L 3. The combination with a shaft and a friction rim revoluble therewith; of a pulley loosely mounted on the shaft, an expansible friction device within the lrim and upon and revoluble with the pulley, a revoluble spreading device connected to the eXpansible friction device', a spring controlled centrifugally operated means upon the pulley for actuating t e spreading device, an adjustable regulating device upon the centrifugally operated means, and manually operated means for rotating the spreading device within, and during the rotation of the pulley. 4. The combination with a revoluble rim 'and a pulley; of an arm secured upon the pulley, oppositely extending bowed members expansib `e friction ring within the rim, cenpulley for vspreading said members against the rim, and manually operated means for rotating the spreading device within, and during the rotation of the ulley.

5. The combination with) a revoluble rim and a pulley revoluble independe tly thereof; of oppositely disposed bowe members connecte to the pulley and within the rim, said members constituting an expansible friction device, a revoluble head upon the pulley, link connections between the head and friction device; and centrifugally operated means for actuating the head to expand the friction device against the rim. i

6. The combination with a revoluble rim, and a pulley; of an .eXpansible friction device connected to the pulley and within the rim, a revoluble head upon the pulley, pivotal connections between the head and opposite portions of the friction device, a centrifugally operated device upon the pulley for actuating the head to expandthe friction ing the centrifugally operated device normally in apredetermined position.

7 The combination with a revoluble rim, and a ulley; of a centrifugally operated eX- pansib e. A friction device connected to the pulley and within the rim, a revoluble head u on the pulley, pivotal connections between t e head and opposite portions of the friction device,v and manually operated means for eXtendln from the arm and constituting an ing device connected to the rin centrifugally l trifugally operated revoluble means uponthe device against the rim, vand means for holdactuating the head to Withdraw the friction l with the head, a slidable element upon the device from the rim. f shaft, andan arm pivotally connecting said 8. The combination Withfa revoluble rim, i element with the arm of the head. a shaft extending therefrom and connected In testimony that I claim the foregoing as 5 thereto, and a loose pulley upon thershaft; of my own, I have hereto affixed my signature 15 a centrifugally operated expansible ,friction 1 in the presence of two Witnesses.

device within the rim and revoluble with the i FRANK A4 COLWELL. pulley, a head upon the pulley, pivotal coni Witnesses: nections between the head and opposite por- E. M. TUCKER,

-10 tions of the friction device, an arm movable 1 T. S. HUTCHINsoN. 

